Found a total of 10000 related content
How to create a private function in PHP?
Article Introduction：A private function is a method defined inside a class and can only be called by that class. In PHP, private functions can be created by using the private keyword, for example: classMyClass{privatefunctionmyPrivateMethod(){echo"Thisaprivatemethod.";}}; Private functions cannot be called directly through object instances, nor can they be inherited by subclasses; common uses include encapsulating internal logic, assisting public methods to complete tasks, and preventing mis-calls; the difference between access modifiers is that public can be called externally, protected allows classes and subclass calls, while private is only limited to
2025-07-07
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863
How to call subclass private attribute in parent class method in PHP
Article Introduction：I want to call the private attribute of the subclass in the parent class, but a 500 error is reported. {Code...} After this code is run, the server reports a 500 error. Why does calling method_exists return true, or why the method cannot be returned? Thanks.
2016-07-06
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1847
When Does __destruct Fail to Invoke?
Article Introduction：The __destruct method in PHP ensures resource cleanup before object termination. However, factors can prevent its execution: exit() calls in other destructors, exit() in shutdown functions (version-dependent), fatal errors, exceptions in destructors,
2024-10-23
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1008
Understanding the Java Virtual Machine Architecture
Article Introduction：The JVM architecture consists of three core cores: class loader, runtime data area and execution engine; the class loader is responsible for loading .class files, the runtime data area includes heap, stack, etc. for storing data, and the execution engine is responsible for interpreting or compiling bytecode; the heap stores object instances in the runtime data area, the method area saves class information, and stack management method calls; the class loading mechanism includes three stages: loading, linking, and initialization, and follows the parent delegation model to ensure security; mastering these basic structures helps troubleshoot problems and optimize performance.
2025-07-05
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148
Explain the difference between self::, parent::, and static:: in PHP OOP.
Article Introduction：In PHPOOP, self:: refers to the current class, parent:: refers to the parent class, static:: is used for late static binding. 1.self:: is used for static method and constant calls, but does not support late static binding. 2.parent:: is used for subclasses to call parent class methods, and private methods cannot be accessed. 3.static:: supports late static binding, suitable for inheritance and polymorphism, but may affect the readability of the code.
2025-04-09
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1333
How to get the name of the current function in PHP?
Article Introduction：There are three methods to obtain the current execution function name in PHP: 1.\_\_FUNCTION\_\_The name of the magic constant when returning the function definition is suitable for ordinary functions; 2.\_\_METHOD\_\_ is used to return "class name:: method name" in class methods, which can extract the method name through string processing; 3.debug\_backtrace() can dynamically obtain the call stack information to obtain the current execution function name but the performance is low, and it is recommended to be used in debugging scenarios. \_\_FUNCTION\_\_ and \_\_METHOD\_ are simpler and more efficient in their respective contexts and debug\_backtrace() provides a more flexible but heavier solution.
2025-07-06
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200
php get yesterday's date
Article Introduction：There are three ways to get yesterday's date in PHP: use the strtotime() function, combine the date() function to output detailed time, or use the DateTime class for flexible processing. The first method directly obtains yesterday's date through echodate('Y-m-d',strtotime('yesterday')); the second method can output the full time containing time, minutes and seconds, such as echodate('Y-m-dH:i:s',strtotime('yesterday')); the third method uses the object-oriented DateTime class to facilitate the execution of complex date operations, such as adding and subtracting days or setting time zones, with the code as $date=n
2025-07-04
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146
Using Traits in PHP 5.4
Article Introduction：Guide to using Traits in PHP 5.4
Core points
The Traits mechanism introduced in PHP 5.4 allows horizontal reuse of code between independent classes of inheritance hierarchy, solving the limitations of single inheritance and reducing code duplication.
A single class can use multiple Traits, and Traits can also be composed of other Traits, enabling a flexible and modular way of organizing code.
Use instead keyword to resolve conflicts between Traits with the same method name, or use the as keyword to create method alias.
Traits can access private properties or methods of a combined class, and vice versa, and even
2025-02-28
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487
How do I create objects from classes in PHP?
Article Introduction：To create an object in PHP, you must first define the class and then instantiate it with the new keyword. 1. Classes are blueprints of objects, defining attributes and methods; 2. Create object instances using new; 3. Constructors are used to initialize different data; 4. Access attributes and methods through ->; 5. Pay attention to access control of public, private, and protected; 6. Multiple independent instances can be created, each maintaining its status. For example, after defining the Car class, newCar('red') creates an object and passes a parameter, $myCar->startEngine() calls the method, and each object does not affect each other. Mastering these helps build clearer, scalable applications.
2025-06-24
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846
Introspection and Reflection in PHP
Article Introduction：Core points
PHP's introspection mechanism allows programmers to manipulate object classes and check classes, interfaces, properties, and methods. This is especially useful when the class or method to be executed at the time of design is unknown.
PHP provides various introspective functions such as class_exists(), get_class(), get_parent_class(), and is_subclass_of(). These functions provide basic information about classes, such as their names, the names of the parent classes, and so on.
PHP's reflection API provides introspection-like functionality and is richer in providing the number of classes and methods used to complete reflection tasks. The ReflectionClass class is an API
2025-02-27
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265
Python `@property` decorator
Article Introduction：@property is a decorator in Python used to masquerade methods as properties, allowing logical judgments or dynamic calculation of values ??when accessing properties. 1. It defines the getter method through the @property decorator, so that the outside calls the method like accessing attributes; 2. It can control the assignment behavior with .setter, such as the validity of the check value, if the .setter is not defined, it is read-only attribute; 3. It is suitable for scenes such as property assignment verification, dynamic generation of attribute values, and hiding internal implementation details; 4. When using it, please note that the attribute name is different from the private variable name to avoid dead loops, and is suitable for lightweight operations; 5. In the example, the Circle class restricts radius non-negative, and the Person class dynamically generates full_name attribute
2025-07-04
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928
How do I access object properties and methods in PHP?
Article Introduction：To access object properties and methods in PHP, use the -> operator. If the properties or methods are private, they need to be obtained through public methods. The details are as follows: 1. After creating the object, use $object->property or $object->method() to access public properties and methods; 2. Private or protected members need to be accessed indirectly through public methods such as getter/setter; 3. Static properties and methods are directly accessed through class name::. Mastering these rules can effectively avoid misuse of operators and implement encapsulation and control of data.
2025-06-28
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273
Example of using Late Static Binding in PHP.
Article Introduction：Delayed static binding in PHP: flexible database queries
Lazy static binding (LSB) is a feature in PHP that allows a subclass to reference a static property or method of its parent class using the static keyword. This makes it possible to implement dynamic behavior in classes, which is especially useful in inheritance and subclass functionality customization. The core of delayed static binding lies in the use of the static keyword: when the PHP interpreter encounters the static attribute when compiling a function, it will delay determining its value until runtime. The value ultimately comes from the class that calls the function.
Application scenario: dynamic database query
Suppose you are developing a web application with a database. You have a Database base class that contains the methods for interacting with the database
2025-01-16
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813
What are some key features introduced in PHP 8 ?
Article Introduction：PHP8 introduces a number of important new features, significantly improving performance, code readability and development experience. 1. JIT compilation improves execution speed, especially for CPU-intensive tasks, and is controlled through php.ini configuration; 2. Union types support more flexible type declarations, allowing direct definition of multiple parameter types; 3. Named parameters enhance the readability and security of function calls to avoid order errors; 4. Match expressions provide a more concise condition return method than switch, with strict comparison and non-penetration characteristics; 5. Constructor attribute improvement reduces boilerplate code, making class definition more concise; in addition, it also includes improvements such as throw expressions and attribute replacement annotations, making PHP8 more modern, powerful and easy to use overall. Although upgrades require investment,
2025-07-08
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437
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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777
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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